Wear-resistant corrosion- resistant composite steel pipe and preparation method thereof

A composite steel pipe, corrosion-resistant technology, applied in the field of wear-resistant materials, can solve the problems of short service life of composite steel pipe, thin thickness of wear-resistant and corrosion-resistant layer, etc., achieve good economic and social benefits, good wear-resistant and corrosion-resistant performance, excellent The effect of wear and corrosion resistance

Inactive Publication Date: 2018-01-23
XI'AN POLYTECHNIC UNIVERSITY
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  • Abstract
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Problems solved by technology

[0013] The purpose of the present invention is to provide a method for preparing wear-resistant and corrosion-resistant composite steel pipes, which solves the problems that t

Method used

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  • Wear-resistant corrosion- resistant composite steel pipe and preparation method thereof

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preparation example Construction

[0037] A method for preparing a wear-resistant and corrosion-resistant composite steel pipe of the present invention comprises firstly compounding wear-resistant and corrosion-resistant high-chromium cast iron on the inner surface of the steel pipe, and then compounding a wear-resistant and corrosion-resistant coating on the surface of the high-chromium cast iron, specifically implemented according to the following steps:

[0038] Step 1. Process the inner surface of the seamless steel pipe with an inner diameter of 200-600 mm and a wall thickness of 15-65 mm along the circumferential direction to form grooves with a width of 8-12 mm and a depth of 3-5 mm. Coat the inner surface and its grooves with a borax aqueous solution with a thickness of 0.8-1.2mm. The mass percentage of borax and water in the borax aqueous solution is 1:1, and then heat the seamless steel pipe to 680-800°C and keep it warm for 2-3 hours Finally, put it on the horizontal centrifuge, start the centrifuge, ...

Embodiment 1

[0049] A method for preparing a wear-resistant and corrosion-resistant composite steel pipe, specifically implemented according to the following steps:

[0050] ① Firstly process grooves with a width of 8mm and a depth of 3mm on the inner surface of the seamless steel pipe 1 with an inner diameter of Φ200mm, a wall thickness of 15mm, and a length of 3000mm along the circumferential direction. , Coating a borax aqueous solution with a thickness of 0.8-1.0mm, the mass percentage of borax and water in the borax aqueous solution is 1:1, then heat the seamless steel pipe to 680°C, keep it warm for 3 hours, place it on a horizontal centrifuge, and then start centrifuge, and adjust the speed of the centrifuge to 1150rpm, and then pour the high-chromium cast iron molten iron with a temperature of 1487°C into the seamless steel pipe on the horizontal centrifuge. The chemical composition and mass percentage of the high-chromium cast iron molten iron are 2.54C , 26.95Cr, 0.94B, 1.41Si, 0...

Embodiment 2

[0054] A method for preparing a wear-resistant and corrosion-resistant composite steel pipe, specifically implemented according to the following steps:

[0055] ① Firstly process grooves with a width of 12mm and a depth of 5mm on the inner surface of the seamless steel pipe 1 with an inner diameter of Φ600mm, a wall thickness of 65mm, and a length of 6000mm along the circumferential direction. , Coating a borax aqueous solution with a thickness of 1.0-1.2mm, the mass percentage of borax and water in the borax aqueous solution is 1:1, then heat the seamless steel pipe to 800 ° C, keep it warm for 2 hours, place it on a horizontal centrifuge, and then start centrifuge, and adjust the speed of the centrifuge to 1050rpm, and then pour the high-chromium cast iron molten iron with a temperature of 1453°C into the seamless steel pipe on the horizontal centrifuge. The chemical composition and mass percentage of the high-chromium cast iron molten iron are 2.62C , 28.30Cr, 0.88B, 1.57Si...

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Abstract

The invention provides a preparation method of a wear-resistant corrosion-resistant composite steel pipe. The preparation method comprises the steps that firstly, high chromium cast iron is compositedon the inner surface of a seamless steel pipe, and then wear-resistant corrosion-resistant coating is composited on the surface of the high chromium cast iron; and the surface layer of wear-resistantcorrosion-resistant coating is provided with a ceramic layer, and the side, close to the close to the high chromium cast iron, of the wear-resistant corrosion-resistant coating is provided with a chromium alloy cast iron layer. By means of the high chromium cast iron and a seamless steel pipe matrix in the wear-resistant corrosion-resistant composite steel pipe prepared by the preparation method,good metallurgical combining is achieved; the high chromium cast iron is high in rigidity and good in wear and corrosion resistance; in addition, the composite steel pipe liner ceramic layer and thehigh chromium cast iron are well combined, the thickness of the ceramic layer is controlled to be over 2 mm, and excellent wear and corrosion resistance are achieved; and the wear-resistant corrosion-resistant composite steel pipe is used for manufacturing mine conveying slurry pipeline, under the same use condition, the service life of the wear-resistant corrosion-resistant composite steel pipe is greater than that of the seamless steel pipe by 34 times or above and that of chromium cast iron by 3.5 times or above, the excellent wear resistance and corrosion resistance are achieved, and goodeconomic and social benefits are achieved through application and popularization.

Description

technical field [0001] The invention belongs to the technical field of wear-resistant materials, and relates to a wear-resistant and corrosion-resistant composite steel pipe, and also relates to a preparation method of the above-mentioned wear-resistant and corrosion-resistant composite steel pipe. Background technique [0002] In many departments such as metallurgy, mining, petrochemical, national defense and military industry, there is a huge demand for wear-resistant and corrosion-resistant composite steel pipes, such as pipelines for metallurgical mine slurry and tailings. [0003] In order to improve the wear resistance and corrosion resistance of steel pipes, a Chinese patent (application date 2016.08.29, publication number CN206072562U, publication date 2017.04.05) discloses a high wear-resistant steel pipe, including a steel pipe layer, the inner side of which is coated with an alloy Wear-resistant layer, the inner side of the alloy wear-resistant layer is coated wit...

Claims

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Application Information

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IPC IPC(8): B22D19/08B22D13/02
Inventor 符寒光成小乐屈银虎胥光申刘毅刘少飞徐洁
Owner XI'AN POLYTECHNIC UNIVERSITY
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